Proportional pumping system

Abstract

A system for pumping liquid materials with reciprocating pumps driven by hydraulically operated motors, wherein the pressurized hydraulic oil which is used to drive the hydraulic motors is supplied via reciprocating proportioners. The reciprocating proportioners are driven by a reciprocating air motor operated under predetermined air pressure. The system operation is characterized in that, under blocked output pressure conditions, the air motor will inherently stall and thereby limit the pressure of the hydraulic oil acting to drive the hydraulic motors, which therefore limits the pumping pressure applied to the reciprocating pumps, and limits the output pressure of the pumped liquid materials.

What is claimed is: 
     
       1. A system and apparatus for pumping liquids according to predetermined ratios from at least two liquid reservoirs to a common distribution point, comprising (a) a reciprocable pump in each liquid reservoir;   (b) a hydraulically reciprocable motor connected to each pump, said motor having ports for intake and exhaust of hydraulic oil;   (c) an oil collection reservoir connected to all of said hydraulic oil exhaust ports;   (d) a plurality of metering and pumping cylinders, one for each hydraulically reciprocable motor, said cylinders being respectively sized according to predetermined volume ratios and each having a liquid inlet and a liquid outlet, all of said liquid inlets commonly coupled to said oil collection reservoir and each of said liquid outlets respectively connected to a different hydraulic motor intake port;   (e) a reciprocable air-operated motor having a drive member connected in common driving relationship to all of said metering and pumping cylinders; and   (f) means for delivering liquid from respective pumps in said liquid reservoirs to a common distribution point.   
     
     
       2. The apparatus of claim 1, wherein said means for delivering liquid further comprises a plurality of hoses, each having an end connected to a respective reciprocable pump and all having a second end connected to a common manifold. 
     
     
       3. The apparatus of claim 2, further comprising a mixer connected to said common manifold. 
     
     
       4. A liquid pumping and proportioning system for delivering predetermined ratios by volume of several components, comprising (a) a reciprocable pump in liquid flow coupling with each of said liquid components;   (b) means for delivering liquid from each of said reciprocable pumps to a common destination point;   (c) a hydraulic drive motor connected to each of said reciprocable pumps;   (d) a hydraulic oil pumping and delivery cylinder coupled to each of said hydraulic drive motors, said cylinders being respectively sized according to predetermined volume ratios;   (e) a reservoir of hydraulic oil coupled to all of said hydraulic oil pumping and delivery cylinders, and including hydraulic oil exhaust pipes connected between said reservoir and each of hydraulic drive motors; and   (f) an air drive motor having a reciprocable drive member connected in driving relationship to all of said pumping and delivery cylinders.   
     
     
       5. The system of claim 4, wherein said common destination point further comprises a liquid flow manifold and liquid mixer assembly.